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• W1982399338 abstract "We propose a new method for practical non-Gaussian and nonstationary underwater noise modeling. This model is very useful for passive sonar in shallow waters. In this application, measurement of additive noise in natural environment and exhibits shows that noise can sometimes be significantly non-Gaussian and a time-varying feature especially in the variance. Therefore, signal processing algorithms such as direction-finding that is optimized for Gaussian noise may degrade significantly in this environment. Generalized autoregressive conditional heteroscedasticity (GARCH) models are suitable for heavy tailed PDFs and time-varying variances of stochastic process. We use a more realistic GARCH-based noise model in the maximum-likelihood approach for the estimation of direction-of-arrivals (DOAs) of impinging sources onto a linear array, and demonstrate using measured noise that this approach is feasible for the additive noise and direction finding in an underwater environment." @default.
• W1982399338 created "2016-06-24" @default.
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• W1982399338 date "2006-11-05" @default.
• W1982399338 modified "2023-10-17" @default.
• W1982399338 title "Underwater Noise Modeling and Direction-Finding Based on Heteroscedastic Time Series" @default.
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• W1982399338 doi "https://doi.org/10.1155/2007/71528" @default.
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